Toherdisappointment,whatshehaddevotedherselftoinnothingbutfailure.
A.resultingB.resultsC.has resultedD.resulted在线课程D
解析：
考察句子结构。句中主语是what she had devoted herself to，resulted是谓语动词。结合句意可知D正确。句意：让她失望的是，她一直致力所做的事情最终带来的只有失败。